Amazing film. I watched it a few years after my wife and I visited Norway, and a few years after reading the book One of Us, by Asne Seierstad. Both the book and the film were equally powerful. Of course the book goes into much more detail, since it is over 500 pages long. I especially remember the neighbour of the young Brievik, who would not let him near one her pets (I forget now if it was a cat or a dog), since she was already well aware of his penchant for cruelty.